<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <button onclick="send()">发言</button>
    <script src="/socket.io/socket.io.js"></script>
    <script>
        let socket = io('http://localhost:7001');
        socket.on('connect',function() {
            console.log('连接成功');
            socket.emit('getAllMessages');
        })
        socket.on('messageAdded', function(){
            console.log(message);
        })
        function send() {
            socket.emit('addMessage','nihao','吗')
        }
    </script>
</body>
</html>